package dbTest;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;public class JDBCTest {     public static void main(String[] args) {         String driver = "com.mysql.jdbc.Driver";         String dbName = "nnm5";         String passwrod = "OSSDB123";         String userName = "root";         String url = "jdbc:mysql://localhost:13306/" + dbName;         String sql = "select ircnetnodeid, purpose_id,ircnetypeid from rcnetnode limit 1";         Connection conn = null;        PreparedStatement ps = null;        ResultSet rs = null;                try {             Class.forName(driver);             //JDBC获取连接            //Connection conn = DriverManager.getConnection(url, userName,passwrod);             //Druid连接池获取连接            conn = DruidManager.getInstance().getConnection();            ps = conn.prepareStatement(sql);             rs = ps.executeQuery();             while (rs.next()) {                 System.out.println("ircnetnodeid : " + rs.getInt(1) + " purpose_id : "                        + rs.getString(2) + " ircnetypeid : " + rs.getString(3));             }               // 关闭记录集             if (rs != null) {                 try {                     rs.close();                 } catch (SQLException e) {                     e.printStackTrace();                 }             }               // 关闭声明             if (ps != null) {                 try {                     ps.close();                 } catch (SQLException e) {                     e.printStackTrace();                 }             }               // 关闭链接对象             if (conn != null) {                 try {                     conn.close();                 } catch (SQLException e) {                     e.printStackTrace();                 }             }           } catch (Exception e) {             e.printStackTrace();         }finally{        	 // 关闭记录集             if (rs != null) {                 try {                     rs.close();                 } catch (SQLException e) {                     e.printStackTrace();                 }             }               // 关闭声明             if (ps != null) {                 try {                     ps.close();                 } catch (SQLException e) {                     e.printStackTrace();                 }             }               // 关闭链接对象             if (conn != null) {                 try {                     conn.close();                 } catch (SQLException e) {                     e.printStackTrace();                 }             }         }            }   }

package dbTest;import java.sql.Connection;import java.sql.SQLException;import com.alibaba.druid.pool.DruidDataSource;public class DruidManager {	    private DruidManager() {}  	    private static DruidManager single=null;	    private DruidDataSource dataSource;	    public synchronized  static DruidManager getInstance() {	         if (single == null) {  	             single = new DruidManager();	             single.initPool();	         }  	        return single;	    }		private void initPool() {			dataSource = new DruidDataSource();			dataSource.setDriverClassName("com.mysql.jdbc.Driver");			dataSource.setUsername("root");			dataSource.setPassword("OSSDB123");			dataSource.setUrl("jdbc:mysql://127.0.0.1:13306/nnm5");			dataSource.setInitialSize(5);			dataSource.setMinIdle(1);			dataSource.setMaxActive(10);			// 启用监控统计功能			 try {				dataSource.setFilters("stat");			} catch (SQLException e) {							}// for mysql			 dataSource.setPoolPreparedStatements(false);					}				public  Connection getConnection(){			Connection connection = null;			try {				connection = dataSource.getConnection();			} catch (SQLException e) {							}			return connection;		}}	

  <servlet>      <servlet-name>DruidStatView</servlet-name>      <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>  </servlet>  <servlet-mapping>      <servlet-name>DruidStatView</servlet-name>      <url-pattern>/druid/*</url-pattern>  <servlet-mapping>

<bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">		<property name="url" value="http://www.mamicode.com/${jdbc_url}" />		<property name="username" value="http://www.mamicode.com/${jdbc_username}" />		<property name="password" value="http://www.mamicode.com/${jdbc_password}" />		<!-- 初始化连接大小 -->		<property name="initialSize" value="http://www.mamicode.com/0" />		<!-- 连接池最大使用连接数量 -->		<property name="maxActive" value="http://www.mamicode.com/20" />		<!-- 连接池最大空闲 -->		<property name="maxIdle" value="http://www.mamicode.com/20" />		<!-- 连接池最小空闲 -->		<property name="minIdle" value="http://www.mamicode.com/0" />		<!-- 获取连接最大等待时间 -->		<property name="maxWait" value="http://www.mamicode.com/60000" />		<!-- <property name="poolPreparedStatements" value="http://www.mamicode.com/true" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="http://www.mamicode.com/33" /> -->		<property name="validationQuery" value="http://www.mamicode.com/${validationQuery}" />		<property name="testOnBorrow" value="http://www.mamicode.com/false" />		<property name="testOnReturn" value="http://www.mamicode.com/false" />		<property name="testWhileIdle" value="http://www.mamicode.com/true" />		<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->		<property name="timeBetweenEvictionRunsMillis" value="http://www.mamicode.com/60000" />		<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->		<property name="minEvictableIdleTimeMillis" value="http://www.mamicode.com/25200000" />		<!-- 打开removeAbandoned功能 -->		<property name="removeAbandoned" value="http://www.mamicode.com/true" />		<!-- 1800秒，也就是30分钟 -->		<property name="removeAbandonedTimeout" value="http://www.mamicode.com/1800" />		<!-- 关闭abanded连接时输出错误日志 -->		<property name="logAbandoned" value="http://www.mamicode.com/true" />		<!-- 监控数据库 -->		<!-- <property name="filters" value="http://www.mamicode.com/stat" /> -->		<property name="filters" value="http://www.mamicode.com/mergeStat" />	</bean>